Loading patent…
OwnerNikolai S. Enikolopov, Anatoly I. Nepomnyaschy +12inventors
InventorsNikolai S. Enikolopov, Anatoly I. Nepomnyaschy, Viktor A. Pekarsky, Tatyana A. Pekarskaya, Mikhail G. Brusilovsky, Svetlana A. Gavrilina, Naum D. Lerman, Oleg K. Maimur, Arkady L. Iljushin, Mikhail A. Markevich, Susanna M. Karpacheva, Lidia P. Khorkhorina, Valeryan M. Muratov, Semen F. Sholk
Estimating the term…
A process for preparing epoxy resin comprises a step of allowing a mixture of epichlorohydrin, 2,2-bis(p-hydroxyphenyl)propane, and a solvent in the presence of an alkali used in an amount of from 0.4 to 5% by weight of the epichlorohydrin to stay at a temperature of from 45.degree. to 70.degree. C. to obtain a homogeneous mass. Subsequently an alkali used in an amount of from 45 to 50% by weight of the epichlorohydrin is added to the resultant mass, and polycondensation is conducted at a temperature of 70.degree. to 90.degree. C. under stirring to obtain the end product.
A process for preparing epoxy resin, comprising allowing a mixture of epichlorohydrin, 2,2-bis(p-hydroxyphenyl) propane and a solvent in the presence of an alkali used in an amount of from 0.5 to 4% by weight of the epichlorohydrin, to stay at a temperature of from 45.degree. to 70.degree. C. to obtain a homogeneous mass with subsequent adding to the resultant mass of an alkali used in an amount of from 45 to 50% by weight of the epichlorohydrin and conducting polycondensation at a temperature of from 70.degree. to 90.degree. under stirring to obtain the end product.
Dependencies are inferred from the claim text.